Finite element prediction of elastic strains in beryllium compact tension specimens

Conference · Thu May 01 04:00:00 EDT 1997

OSTI ID:475624

Guerra, F; Varma, R; Bourke, M ^[1]

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1. and others

Three-dimensional finite element (FE) calculations using ABAQUS version 5.5.9 were compared to neutron diffraction measurements of a loaded, pre-cracked beryllium compact tension (CT) specimens. The objective was to validate the FE results with the experimental {open_quotes}elastic strain{close_quotes} measurements. Then the FE calculations could be used to study residual stress and other aspects of these problems in the unloaded state and the crack tip stress in the loaded state which is hard to measure experimentally. A graded FE mesh was focused on the regions containing high strain gradients, the smallest elements were approximately 0.5 mm x 0.5 mm x 0.4 mm. A standard 20-node brick element model was complemented by a model with 1/4-point elements at the crack tip. Since the neutron diffraction measurements provided a volume average of approximately a cube of edge 3.0 mm, various averaging (or integrating) techniques were used on the FE results. Several integration schemes showed good agreement with the experimental results.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 475624
• Report Number(s): LA-UR--97-805; CONF-970531--4; ON: DE97005012
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
A CODES
BERYLLIUM
ELASTICITY
FINITE ELEMENT METHOD
RESIDUAL STRESSES
STRAINS